1. Developing an Application with J2ME Technology Scott Palmer, Nat Panchee, Judy Sullivan, Karen Thabet, Sten Westgard

2. Java - “One size does not fit all”

3. Java Technology - Editions Memory footprint decreases

4. J2ME - Characteristics J2ME maintains qualities of Java Technology Consistency across products Portability of code

5. J2ME - Characteristics Run anywhere, anytime and on any device Safe network delivery Upward scalability with J2SE and J2EE technology OOP base language

6. What is a Configuration? Specifies Java Programming language features supported Specifies the JVM features supported Specifies the basic Java libraries and APIs supported

7. J2ME Configurations Connected Device Configuration (CDC) Connected Limited Device Configuration (CLDC) Purpose: – CDC – High end consumer devices – CDLC – Low end consumer devices

8. Java2 Micro Edition - Architecture

9. CDC 32 bit processor >.5MB (ROM+RAM) JVM support High bandwidth network connectivity Devices include: – Communicators – Next Generation Smart Phones – Home Appliances – Car Navigation Systems

10. CLDC 16-32 bit processor >160-512kB (ROM+RAM) KVM support Limited power/battery, network, GUI, Java class libraries Devices include: – Cell phones – Personal Digital Assistants – Pagers

11. CLDC Expert Group America Online Bull Ericsson Fujitsu Matsushita Mitsubishi Motorola Nokia NTT DoCoMo Oracle Palm Computing RIM Samsung Sharp Siemens Sony SunMicrosystems Symbian

12. CLDC Packages CLDC packages: – java.lang – java.io – java.util – javax.microedition.io

13. CLDC CLDC limitations: – No Floating-point Support – No Finalization – Error Handling Limitations – Limited Internationalization Support

14. MIDP – Mobile Information Device Profile MIDP + CLDC = Part of J2ME Runtime Environment MIDP addresses: – User Interface – Persistent storage – Networking – Application model

15. MIDP Packages MIDP Packages: – javax.micoredition.io – javax.microedition.midlet – javax.microedition.lcdui – javax.microedition.rms

16. What is a MIDlet? MIDP Application = MIDlet MIDlet is similar to applet. MIDlet Structure: – startApp() – pauseApp() – destroyApp(boolean unconditional)

17. MIDlet’s Life Cycle destroyApp( ) Paused pauseApp( ) Active Destroyed destroyApp( ) startApp( )

18. Hello Midlet import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class HelloMidlet extends MIDlet { private Display display; TextBox box = null; public HelloMidlet() { } public void startApp() { display = display.getDisplay(this); box = new TextBox("Midlet Example", "Hello CS616", 20, 0); display.setCurrent(box); } public void pauseApp() { } public void destroyApp(boolean unconditional) { }

19. Hello Midlet

20. J2ME Wireless Toolkit

21. Developer Opportunities Mobile Internet services Value added services Business to business apps

22. A Wireless “Safe Home”

23. Java Enabled Device Future “In 2002, Nokia will deliver more than 50 million Java enable phones; more than 100 million deliveries by end of 2003.” Pekka Ala-Pietila, Nokia President, JavaOne, 2001